Image-forming optical apparatus having a decentered optical surf

Details Image-forming optical apparatus having a decentered optical surf Image-forming optical apparatus having a decentered optical surf

1998-04-30

1999-08-10

Epps, Georgia

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

359637, 359631, G02B 2714

Patent

active

059367733

ABSTRACT:
A compact image-forming optical apparatus which is free from moire fringes and capable of providing an aberration-free, clear image of minimal distortion even at a wide field angle. The image-forming optical apparatus has an objective optical system (104) and an electronic image pickup device (108). The objective optical system (104) has at least one reflecting surface (106, 107) decentered such that the whole surface is tilted with respect to the axial principal ray. The reflecting surface has a rotationally asymmetric surface configuration that corrects rotationally asymmetric decentration aberrations caused by decentration. A low-pass member (103) is disposed in the vicinity of a pupil plane (101) closer to the object than the reflecting surface. The low-pass member cuts off a high-frequency component concerning the object image in a bundle of rays led to the electronic image pickup device (108).

REFERENCES:
patent: 3810221 (1974-05-01), Plummer
patent: 3838931 (1974-10-01), Valla
patent: 4763990 (1988-08-01), Wood
patent: 5035474 (1991-07-01), Moss et al.
patent: 5661603 (1997-08-01), Hanano et al.
patent: 5701202 (1997-12-01), Takahashi

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